qemu/atomic.h: rename atomic_ to qatomic_

clang's C11 atomic_fetch_*() functions only take a C11 atomic type
pointer argument. QEMU uses direct types (int, etc) and this causes a
compiler error when a QEMU code calls these functions in a source file
that also included <stdatomic.h> via a system header file:

  $ CC=clang CXX=clang++ ./configure ... && make
  ../util/async.c:79:17: error: address argument to atomic operation must be a pointer to _Atomic type ('unsigned int *' invalid)

Avoid using atomic_*() names in QEMU's atomic.h since that namespace is
used by <stdatomic.h>. Prefix QEMU's APIs with 'q' so that atomic.h
and <stdatomic.h> can co-exist. I checked /usr/include on my machine and
searched GitHub for existing "qatomic_" users but there seem to be none.

This patch was generated using:

  $ git grep -h -o '\<atomic\(64\)\?_[a-z0-9_]\+' include/qemu/atomic.h | \
    sort -u >/tmp/changed_identifiers
  $ for identifier in $(</tmp/changed_identifiers); do
        sed -i "s%\<$identifier\>%q$identifier%g" \
            $(git grep -I -l "\<$identifier\>")
    done

I manually fixed line-wrap issues and misaligned rST tables.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200923105646.47864-1-stefanha@redhat.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/dump/dump.c b/dump/dump.c
index 13fda440a4..45da46a952 100644
--- a/dump/dump.c
+++ b/dump/dump.c
@@ -1572,7 +1572,7 @@ static void dump_state_prepare(DumpState *s)
 bool dump_in_progress(void)
 {
     DumpState *state = &dump_state_global;
-    return (atomic_read(&state->status) == DUMP_STATUS_ACTIVE);
+    return (qatomic_read(&state->status) == DUMP_STATUS_ACTIVE);
 }
 
 /* calculate total size of memory to be dumped (taking filter into
@@ -1882,7 +1882,7 @@ static void dump_process(DumpState *s, Error **errp)
 
     /* make sure status is written after written_size updates */
     smp_wmb();
-    atomic_set(&s->status,
+    qatomic_set(&s->status,
                (local_err ? DUMP_STATUS_FAILED : DUMP_STATUS_COMPLETED));
 
     /* send DUMP_COMPLETED message (unconditionally) */
@@ -1908,7 +1908,7 @@ DumpQueryResult *qmp_query_dump(Error **errp)
 {
     DumpQueryResult *result = g_new(DumpQueryResult, 1);
     DumpState *state = &dump_state_global;
-    result->status = atomic_read(&state->status);
+    result->status = qatomic_read(&state->status);
     /* make sure we are reading status and written_size in order */
     smp_rmb();
     result->completed = state->written_size;
@@ -2013,7 +2013,7 @@ void qmp_dump_guest_memory(bool paging, const char *file,
               begin, length, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
-        atomic_set(&s->status, DUMP_STATUS_FAILED);
+        qatomic_set(&s->status, DUMP_STATUS_FAILED);
         return;
     }